keyword
MENU ▼
Read by QxMD icon Read
search

Influenza polymerase

keyword
https://www.readbyqxmd.com/read/28530165/basic-amino-acids-in-the-n-terminal-half-of-the-pb2-subunit-of-influenza-virus-rna-polymerase-are-involved-in-both-transcription-and-replication
#1
Koyu Hara, Takahito Kashiwagi, Nobuyuki Hamada, Hiroshi Watanabe
The PB2 subunit of influenza virus RNA polymerase is known to be involved in the initiation of transcription of the virus genome via cap binding. However, other specific roles of PB2 for viral RNA synthesis are not well understood. Here, we demonstrate that basic residues, 124R, 142R, 143R, 268R and 331K/332R, in the N-terminal half of PB2 are important for the polymerase activity. Notably, R124A mutation remarkably reduced the synthesis of mRNA, cRNA and vRNA in vivo, which was in good agreement with the data obtained in vitro...
May 22, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28515301/the-influenza-a-virus-ns1-protein-promotes-efficient-nuclear-export-of-unspliced-viral-m1-mrna
#2
Carina F Pereira, Eliot K C Read, Helen M Wise, Maria J Amorim, Paul Digard
Influenza A virus mRNAs are transcribed by the viral RNA-dependent RNA polymerase in the cell nucleus before being exported to the cytoplasm for translation. Segment 7 produces two major transcripts: an unspliced mRNA that encodes the M1 matrix protein and a spliced transcript that encodes the M2 ion channel. Export of both mRNAs is dependent on the cellular NXF1/TAP pathway but it is unclear how they are recruited to the export machinery or how the intron-containing but unspliced M1 mRNA bypasses the normal quality control checkpoints...
May 17, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28505175/structural-insights-into-reptarenavirus-cap-snatching-machinery
#3
Maria Rosenthal, Nadja Gogrefe, Dominik Vogel, Juan Reguera, Bianka Rauschenberger, Stephen Cusack, Stephan Günther, Sophia Reindl
Cap-snatching was first discovered in influenza virus. Structures of the involved domains of the influenza virus polymerase, namely the endonuclease in the PA subunit and the cap-binding domain in the PB2 subunit, have been solved. Cap-snatching endonucleases have also been demonstrated at the very N-terminus of the L proteins of mammarena-, orthobunya-, and hantaviruses. However, a cap-binding domain has not been identified in an arena- or bunyavirus L protein so far. We solved the structure of the 326 C-terminal residues of the L protein of California Academy of Sciences virus (CASV), a reptarenavirus, by X-ray crystallography...
May 15, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28490593/evolution-and-antiviral-specificity-of-interferon-induced-mx-proteins-of-bats-against-ebola-influenza-and-other-rna-viruses
#4
Jonas Fuchs, Martin Hölzer, Mirjam Schilling, Corinna Patzina, Andreas Schoen, Thomas Hoenen, Gert Zimmer, Manja Marz, Friedemann Weber, Marcel A Müller, Georg Kochs
Bats serve as a reservoir for various, often zoonotic viruses, including significant human pathogens such as Ebola- and influenza viruses. However, for unknown reasons, viral infections rarely cause clinical symptoms in bats. A tight control of viral replication by the host innate immune defense might contribute to this phenomenon. Transcriptomic studies revealed the presence of the interferon-induced antiviral myxovirus resistance (Mx) proteins in bats, but detailed functional aspects have not been assessed...
May 10, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28482840/blood-and-sputum-eosinophils-in-copd-relationship-with-bacterial-load
#5
Umme Kolsum, Gavin C Donaldson, Richa Singh, Bethan L Barker, Vandana Gupta, Leena George, Adam J Webb, Sarah Thurston, Anthony J Brookes, Timothy D McHugh, Jadwiga A Wedzicha, Christopher E Brightling, Dave Singh
BACKGROUND: Sputum and blood eosinophil counts predict corticosteroid effects in COPD patients. Bacterial infection causes increased airway neutrophilic inflammation. The relationship of eosinophil counts with airway bacterial load in COPD patients is uncertain. We tested the hypothesis that bacterial load and eosinophil counts are inversely related. METHODS: COPD patients were seen at stable state and exacerbation onset. Sputum was processed for quantitative polymerase chain reaction detection of the potentially pathogenic microorganisms (PPM) H...
May 8, 2017: Respiratory Research
https://www.readbyqxmd.com/read/28475896/the-rna-exosome-syncs-iav-rnapii-transcription-to-promote-viral-ribogenesis-and-infectivity
#6
Alexander Rialdi, Judd Hultquist, David Jimenez-Morales, Zuleyma Peralta, Laura Campisi, Romain Fenouil, Natasha Moshkina, Zhen Zhen Wang, Brice Laffleur, Robyn M Kaake, Michael J McGregor, Kelsey Haas, Evangelos Pefanis, Randy A Albrecht, Lars Pache, Sumit Chanda, Joanna Jen, Jordi Ochando, Minji Byun, Uttiya Basu, Adolfo García-Sastre, Nevan Krogan, Harm van Bakel, Ivan Marazzi
The nuclear RNA exosome is an essential multi-subunit complex that controls RNA homeostasis. Congenital mutations in RNA exosome genes are associated with neurodegenerative diseases. Little is known about the role of the RNA exosome in the cellular response to pathogens. Here, using NGS and human and mouse genetics, we show that influenza A virus (IAV) ribogenesis and growth are suppressed by impaired RNA exosome activity. Mechanistically, the nuclear RNA exosome coordinates the initial steps of viral transcription with RNAPII at host promoters...
May 4, 2017: Cell
https://www.readbyqxmd.com/read/28474624/viruses-causing-severe-acute-respiratory-infections-sari-in-children-%C3%A2-5-years-of-age-at-a-tertiary-care-hospital-in-rajasthan-india
#7
Bharti Malhotra, M Anjaneya Swamy, P V Janardhan Reddy, M L Gupta
BACKGROUND & OBJECTIVES: Severe acute respiratory infection (SARI) is one of the leading causes of death among children worldwide. As different respiratory viruses exhibit similar symptoms, simultaneous detection of these viruses in a single reaction mixture can save time and cost. The present study was done in a tertiary care children's hospital for rapid identification of viruses causing SARI among children less than or equal to five years of age using multiplex real-time reverse transcription polymerase chain reaction (RT-PCR) kit...
December 2016: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/28468008/effect-of-maxing-shigan-tang-on-h1n1-influenza-a-virus-associated-acute-lung-injury-in-mice
#8
Yanchun Zhong, Jie Zhou, Ning Liang, Bihao Liu, Ruirui Lu, Yu He, Chunlin Liang, Junbiao Wu, Yuan Zhou, Miaomiao Hu, Jiuyao Zhou
OBJECTIVE: This study is aimed at examining the effects of Maxing Shigan Tang (MST) treatment on H1N1-associated acute lung injury (ALI) and exploring the possible mechanism. MATERIAL AND METHODS: Mice were randomly divided into a control group, model group, peroxisomal proliferator activator receptor γ (PPARγ) inhibition group (PPARγ-), PPARγ activation group (PPARγ+), and MST group. Influenza A (H1N1) virus of the Fort Monmouth 1 (FM1) strain was used to induce an ALI mice model...
May 4, 2017: Intervirology
https://www.readbyqxmd.com/read/28439196/clinical-differences-of-influenza-subspecies-among-hospitalized-children
#9
Manolya Acar, Murat Sütçü, Hacer Aktürk, Selda Hançerli Törün, Metin Uysalol, Sevim Meşe, Nuran Salman, Ayper Somer
AIM: Clinical findings, mortality, and morbidity rates differ among influenza subspecies. Awareness of these differences will lead physicians to choose the proper diagnostic and therapeutic strategies and to foresee possible complications. The aim of this study was to evaluate the clinical differences of influenza subspecies among hospitalized children. MATERIAL AND METHODS: Hospitalized children with proven influenza infection by polymerase chain reaction on nasopharyngeal swab specimens in our clinic, between December 2013 and March 2016, were enrolled...
March 2017: Türk Pediatri Arşivi
https://www.readbyqxmd.com/read/28438112/h3n2-canine-influenza-virus-infection-in-a-dog
#10
C E Watson, C Bell, K Toohey-Kurth
In 2015, H3N2 canine influenza emerged in dogs in the greater Chicago area. During this time, a 10-year-old German Shepherd dog presented to the referring veterinarian with lethargy and coughing that quickly progressed to death. This report describes the macroscopic and microscopic lesions and the molecular testing performed to identify the novel North American H3N2 strain of canine influenza. The larynx, pharynx, and trachea were covered by a fibrinonecrotic membrane. Bilaterally, the lungs had multifocal subpleural necrosis of the caudal lung lobes with hemorrhage, congestion, and pulmonary edema...
May 2017: Veterinary Pathology
https://www.readbyqxmd.com/read/28430397/respiratory-virus-detection-during-hospitalisation-for-lower-respiratory-tract-infection-in-children-under-2-years-in-south-auckland-new-zealand
#11
Adrian A Trenholme, Emma J Best, Alison M Vogel, Joanna M Stewart, Charissa J Miller, Diana R Lennon
AIM: To describe respiratory virus detection in children under 2 years of age in a population admitted with lower respiratory infection and to assess correlation with measures of severity. METHODS: Nasopharyngeal aspirates from infants admitted with lower respiratory tract infection (n = 1645) over a 3-year time period were tested by polymerase chain reaction. We collected epidemiological and clinical data on all children. We assessed the correlation of presence of virus with length of hospital stay, intensive care admission and consolidation on chest X-ray...
April 21, 2017: Journal of Paediatrics and Child Health
https://www.readbyqxmd.com/read/28424887/a-metagenomics-study-for-the-identification-of-respiratory-viruses-in-mixed-clinical-specimens-an-application-of-the-iterative-mapping-approach
#12
Yu-Nong Gong, Shu-Li Yang, Guang-Wu Chen, Yu-Wen Chen, Yhu-Chering Huang, Hsiao-Chen Ning, Kuo-Chien Tsao
Metagenomic approaches to detect viral genomes and variants in clinical samples have various challenges, including low viral titers and bacterial and human genome contamination. To address these limitations, we examined a next-generation sequencing (NGS) and iterative mapping approach for virus detection in clinical samples. We analyzed 40 clinical specimens from hospitalized children diagnosed with acute bronchiolitis, croup, or respiratory tract infections in which virus identification by viral culture or polymerase chain reaction (PCR) was unsuccessful...
April 19, 2017: Archives of Virology
https://www.readbyqxmd.com/read/28421062/identification-of-rare-pb2-d701n-mutation-from-a-patient-with-severe-influenza-contribution-of-the-pb2-d701n-mutation-to-the-pathogenicity-of-human-influenza
#13
Amelia Nieto, Francisco Pozo, Matxalen Vidal-García, Manuel Omeñaca, Inmaculada Casas, Ana Falcón
Several amino acid changes have been previously implicated in adaptation of avian influenza viruses to human hosts, among them the D701N change in the PB2 polymerase subunit that also is the main determinant of avian virus pathogenesis in animal models. However, previous studies using recombinant viruses did not provide conclusive information of the contribution of this PB2 residue to pathogenicity in human influenza virus strains. We identified this mutation in an A(H1N1)pdm09-like human influenza virus isolated from an infected patient with pneumonia and acute respiratory failure, admitted to the intensive care unit...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28417272/early-administration-of-neuraminidase-inhibitors-in-adult-patients-hospitalized-for-influenza-does-not-benefit-survival-a-retrospective-cohort-study
#14
S-H Choi, T Kim, K-H Park, Y G Kwak, J-W Chung, M S Lee
The administration of neuraminidase inhibitors (NAIs) within 2 days after the onset of symptoms (early NAI therapy) has been shown to reduce mortality in adult patients with severe influenza. However, there is no sufficiently solid evidence supporting the effectiveness of early NAI therapy on mortality. We reviewed the clinical data from 506 adult patients who were hospitalized for influenza between March 2010 and March 2014, to investigate the impact of early NAI therapy on mortality. Nearly one-third of the study patients were infected with influenza B (influenza A, influenza B, and co-infection of both in 68...
April 18, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28411129/detection-of-a-novel-highly-pathogenic-h7-influenza-virus-by-duplex-real-time-reverse-transcription-polymerase-chain-reaction
#15
Weixin Jia, Chenfu Cao, Yanxing Lin, Liangning Zhong, Shumin Xie, Xiao Wang, Sanhong Yin, Zhenna Xu, Yixue Dai, Zhixian Li, Xiao Niu, Wenbao Qi, Tikang Lu, Ming Liao
On February 19, 2017, China announced that the mutant H7N9 virus appeared in human cases, which showed molecular characteristic of highly pathogenic virus for poultry. In this study, a duplex real-time reverse transcription polymerase chain reaction (rRT-PCR) assay was developed for distinguish between highly pathogenic H7 virus and low pathogenic H7 virus. The sensitivity, specificity, stability and conformance tests were conducted for this method. The data showed that the new method is sensitive. The minimum detection limit for the RNA of highly pathogenic H7 virus is 0...
April 12, 2017: Journal of Virological Methods
https://www.readbyqxmd.com/read/28408121/effectiveness-of-live-attenuated-influenza-vaccine-and-inactivated-influenza-vaccine-in-children-during-the-2014-2015-season
#16
Huong Q McLean, Herve Caspard, Marie R Griffin, Katherine A Poehling, Manjusha Gaglani, Edward A Belongia, H Keipp Talbot, Timothy R Peters, Kempapura Murthy, Christopher S Ambrose
BACKGROUND: A clinical study found that live attenuated influenza vaccine (LAIV) was superior to inactivated influenza vaccine (IIV) against drifted A(H3N2) viruses in children. During the 2014-2015 influenza season, widespread circulation of antigenically and genetically drifted A(H3N2) viruses provided an opportunity to evaluate subtype-specific vaccine effectiveness (VE) of quadrivalent LAIV (LAIV4) and IIV in children. METHODS: Children (2-17years) with febrile acute respiratory illness <5days' duration were enrolled at 4 outpatient sites in the United States during the 2014-2015 influenza season...
May 9, 2017: Vaccine
https://www.readbyqxmd.com/read/28406194/influenza-c-in-lancaster-uk-in-the-winter-of-2014-2015
#17
Kate V Atkinson, Lisa A Bishop, Glenn Rhodes, Nicolas Salez, Neil R McEwan, Matthew J Hegarty, Julie Robey, Nicola Harding, Simon Wetherell, Robert M Lauder, Roger W Pickup, Mark Wilkinson, Derek Gatherer
Influenza C is not included in the annual seasonal influenza vaccine, and has historically been regarded as a minor respiratory pathogen. However, recent work has highlighted its potential role as a cause of pneumonia in infants. We performed nasopharyngeal or nasal swabbing and/or serum sampling (n = 148) in Lancaster, UK, over the winter of 2014-2015. Using enzyme-linked immunosorbent assay (ELISA), we obtain seropositivity of 77%. By contrast, only 2 individuals, both asymptomatic adults, were influenza C-positive by polymerase chain reaction (PCR)...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28400751/ethanolic-extract-of-melia-fructus-has-anti-influenza-a-virus-activity-by-affecting-viral-entry-and-viral-rna-polymerase
#18
Young-Hee Jin, Jang-Gi Choi, Won-Kyung Cho, Jin Yeul Ma
Meliae Fructus (MF) is the dried ripe fruit of Melia toosendan Siebold et Zuccarini, Meliaceae family. MF is widely used in traditional medicine to treat inflammation and helminthic infection and has anti-bacterial, anti-oxidant, anti-cancer, anti-inflammatory, and analgesic activities. However, potential anti-influenza properties of MF have yet to be investigated. We determined whether an ethanolic extract of MF (EMF) has anti-viral activity via an EMF pre-, co-, and post-treatment assay, using the Influenza A/PR/8/34 and H3N2 virus on Madin-Darby canine kidney (MDCK) cells...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28399176/pathological-findings-in-the-red-fox-vulpes-vulpes-stone-marten-martes-foina-and-raccoon-dog-nyctereutes-procyonoides-with-special-emphasis-on-infectious-and-zoonotic-agents-in-northern-germany
#19
Charlotte Lempp, Nicole Jungwirth, Miguel L Grilo, Anja Reckendorf, Arlena Ulrich, Abbo van Neer, Rogier Bodewes, Vanessa M Pfankuche, Christian Bauer, Albert D M E Osterhaus, Wolfgang Baumgärtner, Ursula Siebert
Anthropogenic landscape changes contributed to the reduction of availability of habitats to wild animals. Hence, the presence of wild terrestrial carnivores in urban and peri-urban sites has increased considerably over the years implying an increased risk of interspecies spillover of infectious diseases and the transmission of zoonoses. The present study provides a detailed characterisation of the health status of the red fox (Vulpes vulpes), stone marten (Martes foina) and raccoon dog (Nyctereutes procyonoides) in their natural rural and peri-urban habitats in Schleswig-Holstein, Germany between November 2013 and January 2016 with focus on zoonoses and infectious diseases that are potentially threatening to other wildlife or domestic animal species...
2017: PloS One
https://www.readbyqxmd.com/read/28397477/real-time-pcr-detection-of-the-most-common-bacteria-and-viruses-causing-meningitis
#20
Oya Akkaya, Hulya Iren Guvenc, Serife Yuksekkaya, Aysegul Opus, Asuman Guzelant, Meral Kaya, Muhammet Guzel Kurtoglu, Nurettin Kaya
BACKGROUND: Central nervous system (CNS) infections require prompt diagnosis, as the clinical condition progresses rapidly and may lead to severe permanent sequelae or death. The causative agents include viruses, bacteria, fungi, and parasites. In this study, samples with the diagnosis of CNS infection based on cerebrospinal fluid (CSF) sent to us from other hospitals/labs, were studied by multiplex real-time Polymerase Chain Reaction (PCR) method. The purpose of this study is to demonstrate, retrospectively, the most common bacteria and viruses causing meningitis and seasonal distribution of these agents using the multiplex real-time PCR method in CSF samples...
April 1, 2017: Clinical Laboratory
keyword
keyword
61704
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"